Valve grinding apparatus



1p and makes a job expensive.

Patented Jan. 5, 1937 UNITED STATES PATENT OFFICE VALVE GRINDING APPARATUS Albert E. Wood, Bam@ Creek, Mich.

Application June 21, 1935, Serial No. 27,711

GCIaims. (01.5;1--27) face, on a flat seat, which will avoid the necessity for manual grind-ing of the valve. In grinding these flat valves, particularly in locomotive work, it may take a workman seven or eight hours to grind a single valve. This is very tiresome work With my improved apparatus, the valve and `seat may be placed in proper position with respect to the `apparatus and `the apparatus put into operation so that thereafter the attendant can simply leave the l5 machine todo the work of grinding the valve and 2 In the drawing, in which apparatus embodying my invention is illustrated:

Figure l is an end elevational view ofthe apparatus;

Fig. 2 is a sdeelevational view; Fig. 3 is a sectionon the line 3-3 vci Fig. 2; Fig. .4 is adetail viewof part 4of the control for the valve lifting apparatus; and

Fig..5 isa section on the line 5-.,5 of Fig. 2. Referring to the drawing more in detail, the construction shown comprises a valve ,I having a llat face resting on a fiat valve seat 2, apparatus for moving the Valve back and forth on its seat and f or periodically lifting it from its seat, comprising an .oscillatable rock arm A3 :provided with 3- means for engaging 4the valve, and means for periodically lifting the rock arm comprising a second rock arrn II on which the first rock arm is pivotally mounted at `5cam means 6 for periodically actuating said second rocl; arm, a ratchet and pawl mechanism 1 for actuating the cam 6, having .provision for periodically rincreasing the throwof the ratchet .toeifect .a quick raising `and lowering of the Valve with respect toits seat, a rnotor fordriving the .valve-moving and valve- .lifting apparatus, Aand transmission from the It is customary in grinding a valve of this type on its at seat y to provide an abrasive material between the valve and seat. In order to prevent this `abrasive ifrom Vbecoming ^unevenly distributed between the faces of the `Valve and seat, it is :65 desirable t0 :lift thevalve from ,its Seat occasion- 4 -and Vhence lifting ,the rock arm 3. This lifting ally in Order to effect a re-distribution of the abrasive. l

.In grinding .the valve I, the ,Seat .2 is ,placed .in ,proper position with respect t0 the apparatus, an abrasive is distributed over the face o f the seat 5 the valve is placed on topof the seat. The valve, which has been drilled out to receive the pins I!) ,on the spring-pressed plungers I I, is conneted with the rock arm 3 by turning the thumb buttons L2 on the en ds of these plungers to a 10 position in which the pins I3 on these buttons ,can enter the holes in the sides of the rock arm A3. The springs I4 then force these plungers II inwardly to cause the pins Il) on the ends of the plungers to enter the holes drilled in the sides of ]5 the valve and to cause the plunger heads to enter between the vertical ribs I5 on the Valve. The motor Bis then put in Aoperation to effect rotation of the crank oreccentric I6, causing a back and forth movement of the connecting rod or eccentric link II'due to the engagement of the plunger f head between the ribs I5.

As shown in Figs. 2 and 5, one end of this connecting rod I'I is forked to straddle the upper end of the rock arm 3 and is provided with .1a guide and pivot `pin lil, vthe ends lof which are guided in 4horizontal slots I9 in the frame of the `apparatus and the central portion of which extends though a T-shaped slot or opening 20 inthe rock arm 3. When the rock arm 3 is in its lower position, as shown in Fig. 2, the pivot d pin I8 is inthe upper portion 2| of the T-shaped operate, Athe rotatable motor-driven cam member d 6 presses downwardly on one end of the rock 'lever (l, lifting the other end of the rock lever 4o of the rock arm 3 lifts the valve I from its seat V2, due to the engagement of the pins I0 in the holes drilled in 'the valve. This lifting of the rock arm 3 is suilicient to free the pin I8 on the -connecting rod -from the vupper portion V2| off the T-shaped slotcandto cause it to enter the .lower .elongated slot portion 2.2. In this positionthe pin .I8 on the connecting rod can reciprocate in the slot portion 22 without effecting any rocking movement of the rock arm 3f As the motor-driven cam E continues to rotate, it moves out of vengagerrient with the end of the rock lever 4 and permits the rock arm 3 to drop down to its lower position again, in which the Valve I will be in engagement with its seat 2 and the pin I8 on the connecting rod will be in the upper portion 2| of the T-shaped slot and will effect a reciprocation of the valve on its seat.

In order to move the rock arm 3 quickly from its lowermost to its uppermost position, means are provided, which will be described more in detail hereinafter, for effecting a relatively rapid rotation of the cam member 6 during a portion of its revolution, this being effected in general by lengthening the effective stroke of the pawl 9 on the ratchet wheel 23 which operates the cam shaft 24.

This reciprocation of the valve on its seat with the periodic lifting of the valve from its seat is continued until the valve is properly ground, the periodic lifting of the valve from its seat effecting a re-distribution of the abrasive.

I will now describe more in detail the construction.

The transmission from the motor 8 to the connecting rod Il comprises a worm 25 on the motor shaft, a worm gear 26 driven from this worm, a shaft 21 on which the Worm gear is mounted, a spur pinion 28 mounted on this shaft, a spur gear 29 driven from the spur pinion 28, a second spur gear 30 driven from the first spur gear, a shaft 3l on which this second spur gear 30 is mounted, and the eccentric or crank IB mounted on this shaft 3| on which eccentric one end of the connecting rod I1 is journalled. The transmission from this connecting rod I1 to the ratchet wheel 23 is by means of a link 32 connected at 33 with the reciprocating end of the connecting rod I1, a two-armed lever 34 pivotally mounted at 35 and having its upper end pivotally connected at 36 with the link 32, and the spring-pressed pawl 9 pivotally mounted at 31 on the lower end of the two-armed lever 34 and engaging the ratchet wheel 23. As the end of the connecting rod I1 reciprocates, it will effect a back and forth movement of the pawl 9 which will effect a unidirectional rotation of the ratchet Wheel 23, a non-return pawl 38 (Fig. 1) being provided to prevent backward rotation of the ratchet wheel.

In order tol effect the aforementioned change of speed of the ratchet wheel 23 for preventing the rock arm 3 from being held too long in its uppermost. position, a horse-shoe shaped, rockably-mounted guard member 39 (Figs. 2 and 4) is provided which in one position holds the pawl 9 out of cooperative relation with respect to the ratchet wheel 23 during a substantial portion of the travel of the pawl and in another position permits the pawl to engage the ratchet wheel during substantially the entire travel of the pawl.

.This horse-shoe shaped guard member is pivotally mounted at 35 on the frame and has its lower edge 40 extending into proximity to the point of the pawl 9 so that in its lowermost position the point of the pawl is held out of engagement with the ratchet wheel except during the extreme latter portion of its feeding movement but so that in the raised position of the lower arm of the horse-shoe the pawl will engage the ratchet wheel during substantially its entire movement. A coil torsion spring 4| is provided for the horse-shoe guard member which tends to hold the lower guard arm in its lowermost position. In order to move this guard member to effect the long stroke action of the pawl, a cam member 42 is provided on the rotatable motor-driven shaft 24 which periodically engages a follower portion 43 on the upper arm of the horseshoe guard to move the guard to a position which will enable the pawl to have a long, eective stroke.

This long effective stroke of the pawl takes place at a time when the cam G is effecting a lifting movement of the rock arm 3 so that this rock arm is moved quickly from its lower grinding position to its upper resting position, thus bringing the rock arm 3 quickly to a position of rest by causing a spring positioning member 43a to engage a depression 431) in the upper end of the arm 3. After the arm 3 has been raised to its upper position, the cam 42 passes out from under the follower 43, permitting the horse-shoe member 39 to drop and the short effective stroke of the pawl to be resumed. The cam 6 then travels along the arcuate portion 44 of the rock arm 4 for a time and then moves out of engagement with this arcuate follower, permitting the rock arm 3 to drop quickly to its lower operative position. I have found in practice that good results are secured by designing the apparatus so that the valve will be held in its raised inoperative `position for about eight seconds during each cycle and will be in its lower operative position for about forty seconds during each cycle.

In order to press the pawl into operative engagement with the ratchet wheel a coil compression spring 45 is provided seated in the pocket of the frame of the apparatus and bearing upwardly on the pawl.

Any suitable securing means may be provided for holding the apparatus in position with respect to the work, such as the knurled nuts 46 threaded on the anchor studs 4l.

By the use of this apparatus, it will be seen that the workmen can simply set up the valve and seat in proper position with respect to the apparatus, put the motor into operation, and leave the machine to do the work of grinding the valve.

Further modifications will be apparent to those skilled in the art and it is desired, therefore, that the invention be limited only by the prior art and the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. Apparatus for grinding a valve having a flat face on a flat seat comprising reciprocable means for causing the flat face of the valve to move in a plane back and forth on its seat and means cooperating with said reciprocable means for periodically separating the valve from its seat, said cooperating means comprising an oscillatable rock arm provided with means for engaging the valve and means for periodically lifting said rock arm, said lifting means comprising a second rock arm on which said rst rock arm is pivotally mounted.

2. Apparatus for grinding a valve having a flat face on a flat seat comprising reciprocable means for causing the flat face of the valve to move in a plane back and forth on its seat and means cooperating with said reciprocable means for periodically separating the valve from its seat, said cooperating means comprising an oscillatable rock arm provided With means for engaging the valve and means for periodically lifting said rock arm, said lifting means comprising a second rock arm on which said first rock yarm is pivotally mounted and cam means for periodically actuating said second rock arm.

3. Apparatus for grinding a Valve having a flat face on -a flat seat comprising means for moving the valve back and forth on its seat and for periodically lifting it from its seat comprising an oscillatable rock arm provided with means fonengaging the valve, means for periodically lifting said rock arm, said lifting means comprising a second rock arm on which said first rock arm is pivotally mounted, cam means for periodically actuating said second rock arm, and a ratchet and pawl mechanism for actuating said cam.

4. Apparatus for grinding a valve having a flat face on a at seat comprising means for moving the valve back and forth on its seat and for pe riodically lifting it from its seat comprising an oscillatable rock arm provided with means for engaging the valve, means for periodically lifting said rock arm, said lifting means comprising a second rock arm on which said rst rock arm is pivotally mounted, cam means for periodically actuating said second rock arm, and a ratchet and pawl mechanism for actuating said cam, having provisions for periodically increasing the throw of the ratchet to eiect a quick raising and lowering of the valve with respect to its seat.

5. Apparatus for grinding a Valve having a at face on a flat seat comprising reciprocable means for causing the at face of the Valve to move in a plane back and forth on its seat and means cooperating with said reciprocable means for periodically separating the valve from its seat, said cooperating means comprising an oscillatable rock arm provided with means for engaging the Valve and means for periodically lifting said rock arm, said lifting means comprising a second rock arm on which said i'lrst rock arm is pivotally mounted and rotary cam means for periodically actuating said second rock arm.

6. Apparatus for grinding a valve having a at face on a flat seat comprising means for moving the valve back and forth on its seat and for periodically lifting it from its seat comprising an oscillatable rock arm provided with means for engaging the valve, means for periodically lifting said rock arm, said lifting means comprising a second rock arm on which said rst rock arm is pivotally mounted, rotary cam means for periodically actuating said second rock arm, and means for periodically increasing the speed of the cam to effect a quick raising and lowering of the valve with respect to its seat.

ALBERT E. WOOD. 

